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Journal articles on the topic 'Borehole deviation'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Zhao, Enbiao, Kangnan Li, Xin Yang, and Nan Deng. "Speculum Observation and Trajectory Measurement in Gas Extraction Drilling: A Case Study of Changling Coal Mine." Geofluids 2021 (April 1, 2021): 1–16. http://dx.doi.org/10.1155/2021/5545067.

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Coal will still be China’s basic energy for quite a long time. With the increase of mining depth, gas content and pressure also increase. The problems of gas emission and overrun affect the safety and efficient production of coal resource to a certain extent. In this work, the field test of gas drainage borehole peeping and trajectory measurement in coal seam of Changling coal mine are carried out. These coal seams include C5b coal seam, upper adjacent C5a coal seam, C6a coal seams, C6c in lower adjacent strata, and C5b coal seam in high-level borehole. The view of gas drainage borehole peepin

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2

Yuan, Rui, and Yu Qiu Sun. "Application of Moments in Qualitative Analysis on Borehole Trajectory Curving." Applied Mechanics and Materials 713-715 (January 2015): 1635–39. http://dx.doi.org/10.4028/www.scientific.net/amm.713-715.1635.

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There are many calculation methods of horizontal borehole trajectory, such as cubic spline interpolation function which is based on three-moment equation. By calculating the moments of deviation and azimuth from cubic spline interpolation function respectively, it is easy obtain functions of deviation and azimuth change rate and average borehole curvature to analysis on curving of borehole trajectory. So it is one of the most common methods. However, the moments are always be neglected. Moments of deviation and azimuth, which could be used to qualitatively estimate borehole trajectory curving,

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3

Mastin, Larry. "Effect of borehole deviation on breakout orientations." Journal of Geophysical Research 93, B8 (1988): 9187. http://dx.doi.org/10.1029/jb093ib08p09187.

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4

Sedl�k, V. "Magnetic induction applied to borehole deviation problems." Geotechnical and Geological Engineering 11, no. 1 (1993): 25–35. http://dx.doi.org/10.1007/bf00452919.

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5

Voinov, O. V., G. S. Oganov, and V. A. Reutov. "Model of borehole deviation in anisotropic rock." Soviet Mining Science 27, no. 3 (1991): 244–50. http://dx.doi.org/10.1007/bf02500904.

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6

Yi, Myeong-Jong, Jung-Ho Kim, and Jeong-Sul Son. "Borehole deviation effect in electrical resistivity tomography." Geosciences Journal 13, no. 1 (2009): 87–102. http://dx.doi.org/10.1007/s12303-009-0008-2.

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7

Zeman, Oliver, Michael Schwenn, Josef Schorn, and Konrad Bergmeister. "Statistical Evaluation of the Perpendicularity of Boreholes in Concrete for Post-Installed Fasteners." CivilEng 1, no. 3 (2020): 253–63. http://dx.doi.org/10.3390/civileng1030016.

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The form and the perpendicularity of boreholes influence the ultimate behaviour of post-installed fasteners and are restricted with regard to the concrete surface to 5° in Europe and to 6° in the United States in various regulations (e.g., EAD 330232-00-0601 resp. ACI 355.2-19). It is assumed that the deviation of the borehole from the vertical axis has an effect on the load transfer behaviour of an anchorage. This article investigates on the perpendicularity of vertically downward drilled boreholes using different drilling tools considering hammer drilling, hollow drilling and diamond core dr

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8

Hu, Zhongzhi, Wei Song, Yi Hou, et al. "Simulation Method of Borehole Trajectory Based on Vector Similarity." Mathematical Problems in Engineering 2020 (June 19, 2020): 1–8. http://dx.doi.org/10.1155/2020/4834802.

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For the well planning stage, the application of the designed borehole trajectory (DBT) predicts that the torque and drag is low, and it is impossible to accurately analyze the difficulty and risk of drilling construction. This paper proposes a method for comparing and selecting borehole trajectory control parameters based on the vector cosine similarity. The database for borehole trajectories has been established, and two vectors were designed to represent the control state of the actual borehole trajectory (ABT) and the simulation position of the simulated borehole trajectory (SBT), respectiv

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9

Moldashi, D. N. "Methods and technical solutions for keeping the path of a geotechnological borehole." Gornye nauki i tekhnologii = Mining Science and Technology (Russia) 6, no. 1 (2021): 42–51. http://dx.doi.org/10.17073/2500-0632-2021-1-42-51.

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With increasing depth of exploration and process boreholes (at small drilling diameters), the probability of deviation of the borehole path from design trajectory increases many times; i. e. zenith curvature and azimuth deviation of the borehole path occur. Therefore, developing methods for keeping vertical path of the borehole when drilling deeper horizons of ore bodies is a very topical issue. The paper presents the results of developing a new bottom-hole assembly for drilling boreholes in soft rocks using screw casing centralizers, which provide good stabilizing and centering effects to mit

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10

Majorowicz, J., W. Skinner, J. Safanda, and W. Gosnold. "Differences between repeated borehole temperature logs in the southern Canadian Prairies-validating borehole climatology." Climate of the Past Discussions 2, no. 6 (2006): 1075–104. http://dx.doi.org/10.5194/cpd-2-1075-2006.

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Abstract. Temperature-depth (T-z) profiles from twenty-four shallow boreholes of less than 250 m in depth located in flat, semi-arid areas of the southern Canadian Prairie Provinces initially measured in the late 1980's and early 1990's and repeated between 2004 and 2006 show strong ground surface temperature (GST) warming signatures. GST changes of 0.1–0.2°C, and 0.4°C, are observed between the measurements for the shorter (decade) and longer (two decades) time spans, respectively. Borehole sites with repeated temperature logs are selected to demonstrate that multiple T-z profiles provide gen

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11

Li, Tian Tai, Ming Zhang, Han Lin Zhang, and Li Ping Tang. "A New Method to Determine Mud Density in Deflecting Well." Advanced Materials Research 734-737 (August 2013): 1338–42. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.1338.

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Because of the inclination of borehole, there is a significant difference about the borehole stability between deflecting and vertical well. Borehole stability has a relationship with not only trajectory of well, including deviation angle and azimuth, but also azimuth of earth stress. This paper will start from stress field of wall of borehole to study borehole stability in inclined well. And with suitable destruction model of wall of borehole, the reasonable dynamic model and determine the safe mud density of deflecting well can be obtained exactly. The new model is used so as to calculate an

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Etchecopar, Arnaud, Tetsushi Yamada, and Philip Cheung. "Borehole images for assessing present day stresses." Bulletin de la Société Géologique de France 184, no. 4-5 (2013): 307–18. http://dx.doi.org/10.2113/gssgfbull.184.4-5.307.

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Abstract Borehole images, which are now commonly acquired in the oil industry highlight very precisely damage that affects the borehole wall. Two damage types exist. The first corresponds to drilling operations: corkscrew effect, keyseat, cave etc. The second is related to present day stresses: induced fractures, breakouts or shear on preexisting planes. In addition to the real borehole damage, the acquisition and the processing of the image data may bring confusion in the identification of what is due to stresses. A new processing and filtering method is proposed for identifying the stress in

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13

Wang, Hongbo, and Shimin Dong. "Spatial Transverse Vibration Simulation Model of Axially Moving Sucker Rod String under the Excitation of Curved Borehole." Shock and Vibration 2020 (August 6, 2020): 1–18. http://dx.doi.org/10.1155/2020/3108718.

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The mechanical model of transverse vibration of sucker rod string (SRS) in directional well is simplified to the transverse vibration model of longitudinal and transverse curved beam with initial bending under borehole constraints. In this paper, besides considering the excitation of alternating axial load on the transverse vibration of SRS, it is proposed for the first time that curved borehole is also the main excitation for the transverse vibration when the SRS moves reciprocating axially in the borehole. Based on the elastic body vibration theory, the transverse vibration mathematical mode

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14

Bulant, Petr, Leo Eisner, Ivan Pšenčík, and Joël Le Calvez. "Importance of borehole deviation surveys for monitoring of hydraulic fracturing treatments." Geophysical Prospecting 55, no. 6 (2007): 891–99. http://dx.doi.org/10.1111/j.1365-2478.2007.00654.x.

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15

Xu, Zunyu. "Discussion on Deviation Correction Technology of Long Borehole in Gas Drainage." IOP Conference Series: Earth and Environmental Science 651 (February 10, 2021): 032079. http://dx.doi.org/10.1088/1755-1315/651/3/032079.

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Chirchir*, Emily, Samuel Lutta, and Jackson Cherutoi. "Analysis of organophosphates in borehole water of Mailinne and Sosianni, Uasin Gishu county, Kenya." International Journal of Bioassays 5, no. 10 (2016): 4927. http://dx.doi.org/10.21746/ijbio.2016.10.002.

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The noxiousness of pesticides as well as their harmful environmental effects have generated interests in the identification and quantification of organophosphate in borehole water. These contaminants can move from agricultural land or poorly managed sewerage systems and get into drinking water by surface runoff or by leaching into groundwater. The study sought to analyze the organophosphates contaminants of borehole water of Maili-nne a residential area and Sosiani an agricultural area. This was through detection of organic contaminants in borehole water; quantification of the detected organoc

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Tang, Fujian, Jianzhou Yang, Hong-Nan Li, et al. "Field Validation of a Magnetic Sensor to Monitor Borehole Deviation during Tunnel Excavation." Materials 11, no. 9 (2018): 1511. http://dx.doi.org/10.3390/ma11091511.

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In this article, a magnetic sensor is proposed to monitor borehole deviation during tunnel excavation. It is made by piling four super-strong N42 NdFeB cylinder magnets and then encasing them in an aluminum alloy hollow cylinder. The distribution of the magnetic field produced by the magnetic sensor and its summation with the geomagnetic field (GMF) in a global coordinate system are derived based on the theory of magnetic fields. An algorithm is developed to localize the position of the magnetic sensor. The effect of the GMF variation on the effective monitoring range of the magnetic sensor is

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18

Kochkodan, Ya M., and A. I. Vasko. "The Study of the Interaction of Different Arrangements of the Bottom-Hole Assembly with the Bottomhole and the Borehole Wall." Prospecting and Development of Oil and Gas Fields, no. 3(72) (September 30, 2019): 58–68. http://dx.doi.org/10.31471/1993-9973-2019-3(72)-58-68.

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The article presents the main factors affecting the buckling when drilling vertical wells. The authors study analytically the effect of the weight on the bit and the force of the interaction of a drill string with a borehole wall using a uniform-sized arrangement of the bottom-hole assembly and the borehole wall which is located in a deviated wellbore when drilling in isotropic rocks in case the drilling direction coincides with the direction of the force acting on the bit. Differential equations of the elastic axis of the drill string are worked out. The solutions of these equations have give

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Sun, Shi Hui, Tie Yan, Xue Liang Bi, and Peng Wang. "Analysis on the Influence Factors of Well Deviation in Gas Drilling." Advanced Materials Research 577 (October 2012): 132–36. http://dx.doi.org/10.4028/www.scientific.net/amr.577.132.

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Well deviation control has become a bottleneck restraining the development of gas drilling. Without lubrication of drilling fluid and the existence of negative pressure differential, the reasons of well deviation in gas drilling are different from in mud drilling. The effects of stress distribution difference, rock-breaking mechanism, well bore enlargement and water export on well deviation during both gas drilling and mud drilling are compared and studied on the basis of the previous studies in this paper. The conclusion demonstrates that the new stress state of the bottom rock, the uneven cr

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20

Carvalho, Paulo Roberto de, Cícero Régis, and Valdelírio da Silva e. Silva. "EFFECTS OF THE DEVIATION ANGLE OF THE BOREHOLE IN THE INDUCTION ANISOTROPY LOGS." Revista Brasileira de Geofísica 36, no. 4 (2018): 1. http://dx.doi.org/10.22564/rbgf.v36i4.1964.

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ABSTRACT. This paper performs an analysis of the effects of the well’s deviated angle on the tensor triaxial induction tool signals within a thinly sand-shale laminated reservoirs and their equivalent intrinsic anisotropic models. The responses from coaxial and coplanar coil arrays in inclined wells are studied in detail, including the analysis of their apparent anisotropy logs, as well as their estimation of sand conductivity in the environments with a structural anisotropy.The dip angle effects are modeled in simple geometries as one-dimensional (1D) models, neglecting the presence of the bo

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21

Drury, Malcolm, and Alan Taylor. "Some new measurements of heat flow in the Superior Province of the Canadian Shield." Canadian Journal of Earth Sciences 24, no. 7 (1987): 1486–89. http://dx.doi.org/10.1139/e87-140.

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Borehole heat-flow measurements are reported from six new sites in the Superior Province of the Canadian Shield. Values adjusted for glaciation effects, but not for Holocene climatic variations, range from 42 to 56 mW/m2. When these new values are combined with 21 previously published borehole values the mean is 42 mW/m2 with a standard deviation of 11 mW/m2. The data for a site on the Lac du Bonnet batholith suggest that the batholith has a thin veneer, less than 3 km, of rock of high radiogenic heat production at the surface.

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22

Frooqnia, Amir, Carlos Torres-Verdín, Kamy Sepehrnoori, and Rohollah Abdhollah-Pour. "Transient Coupled Borehole/Formation Fluid-Flow Model for Interpretation of Oil/Water Production Logs." SPE Journal 22, no. 01 (2016): 389–406. http://dx.doi.org/10.2118/183628-pa.

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Summary Interpretation of two-phase production logs (PLs) traditionally constructs borehole fluid-flow models decoupled from the physics of reservoir rocks. However, quantifying formation dynamic petrophysical properties from PLs requires simultaneous modeling of both borehole and formation fluid-flow phenomena. This paper develops a novel transient borehole/formation fluid-flow model that allows quantification of the effect of formation petrophysical properties on measurements acquired with production-logging tools (PLTs). We invoke a 1D, isothermal, two-fluid formulation to simulate borehole

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23

Jahanbin, Aminhossein, Giovanni Semprini, Andrea Natale Impiombato, Cesare Biserni, and Eugenia Rossi di Schio. "Effects of the Circuit Arrangement on the Thermal Performance of Double U-Tube Ground Heat Exchangers." Energies 13, no. 12 (2020): 3275. http://dx.doi.org/10.3390/en13123275.

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Given that the issue of variations in geometrical parameters of the borehole heat exchanger (BHE) revolves around the phenomenon of thermal resistance, a thorough understanding of these parameters is beneficial in enhancing thermal performance of BHEs. The present study seeks to identify relative changes in the thermal performance of double U-tube BHEs triggered by alterations in circuit arrangements, as well as the shank spacing and the borehole length. The thermal performance of double U-tube BHEs with different configurations is comprehensively analyzed through a 3D transient numerical code

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Hubbard, Bryn, and Terry Malone. "Optical-televiewer-based logging of the uppermost 630 m of the NEEM deep ice borehole, Greenland." Annals of Glaciology 54, no. 64 (2013): 83–89. http://dx.doi.org/10.3189/2013aog64a201.

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Abstract We report on the application of optical televiewing (OPTV) to the uppermost 630 m of the North Greenland Eemian Ice Drilling (NEEM) deep ice borehole, Greenland. The resulting log reveals numerous natural and drilling-related properties, including the integrity of the borehole casing and its joints, the presence of drill-tooth scoring on the ice wall of the borehole and the presence of regularly repeated layering, interpreted to be annual, to a depth approaching 200 m. A second OPTV log was acquired from a nearby shallow borehole. With the exception of the uppermost ∼10 m, this log sh

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Tan, Qiang, Jin Gen Deng, and Bao Hua Yu. "Study on Borehole Stability of Unconsolidated Sandstone in Depleted Reservior." Advanced Materials Research 616-618 (December 2012): 720–25. http://dx.doi.org/10.4028/www.scientific.net/amr.616-618.720.

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Reservoir pressure will decline generally along with production in the oil and gas development process. There are some problems such as borehole collapse or reduced diameter and lost circulation in drilling of initial production stage in unconsolidated sandstone. As the formation pressure declines the stress around borehole changes, and then collapse pressure and fracture pressure are affected. Especially in directional wells, variation of wellbore stability is more complex with different borehole deviation and azimuth. The calculation models of collapse and fracture pressure in depleted reser

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Kück, Jochem, Marco Groh, Martin Töpfer, Andreas Jurczyk, and Ulrich Harms. "New geophysical memory-logging system for highly unstable and inclined scientific exploration drilling." Scientific Drilling 29 (April 26, 2021): 39–48. http://dx.doi.org/10.5194/sd-29-39-2021.

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Abstract. We established a cable-free memory-logging system for drill-string-deployed geophysical borehole measurements. For more than 20 years, various so-called “logging while tripping” (LWT) techniques have been available in the logging service industry. However, this method has rarely been used in scientific drilling, although it enables logging in deviated and unstable boreholes, such as in lacustrine sediment drilling projects. LWT operations have a far lower risk of damage or loss of downhole logging equipment compared with the common wireline logging. For this purpose, we developed, te

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Zhang, Hui Zeng, Zhi Chuan Guan, Yu Qiang Xu, Qian Deng Li, and Ling Chao Xuan. "Research Progress of Extended-Reach Well Antifriction Technology." Advanced Materials Research 868 (December 2013): 638–44. http://dx.doi.org/10.4028/www.scientific.net/amr.868.638.

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There is a remarkable friction between drill string and borehole in extended-reach wells and horizontal wells due to large deviation angle, contact between drill string and borehole, non-rotation of drill string. The large friction and torque will induce blocked bit weight, low ROP, constrained drill string extension. This article summarizes the common used antifriction methods and tools in extended-reach wells, focusing on Non-Rotation Drill Pipe Protector (NRDPP), roller antifriction tools and vibration antifriction tools. The working principle, structure design, performance and field applic

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Sinha, Bikash K., Andrew N. Norris, and Shu‐Kong Chang. "Borehole flexural modes in anisotropic formations." GEOPHYSICS 59, no. 7 (1994): 1037–52. http://dx.doi.org/10.1190/1.1443660.

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A perturbation method of solution is an efficient way of analyzing elastic wave propagation along a borehole in anisotropic formations. The perturbation model allows us to calculate changes in the modal dispersion curves caused by the differences in elastic constants between the anisotropic formation of interest and a reference, or unperturbed, isotropic formation. The equivalent isotropic constants in the reference formation are obtained from the appropriate compressional‐and shear‐wave velocities for the selected propagation and polarization directions of the flexural mode. This choice of th

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Tutuncu, Azra N., Mikhail Geilikman, Brent Couzens, and Floris van Duyvenboode. "Integrated wellbore-quality and risk-assessment study guides successful drilling in Amazon jungle." GEOPHYSICS 71, no. 6 (2006): E99—E105. http://dx.doi.org/10.1190/1.2356257.

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Significant lost-circulation and wellbore-instability problems in the form of bit balling, stuck pipe, and adverse mud-shale interactions have been experienced in wells drilled prior to the study at three prospects in the Amazon jungle. An integrated borehole-stability and risk-assessment study has been carried out to enable successful drilling by optimizing borehole fluid pressures and predicting safe openhole times in various troublesome zones. The guidelines for hole-cleaning parameters and well-trajectory optimization have been obtained using improved fracture gradient and horizontal stres

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Aleksandr, Kuriachii, and Kaliagin Sergei. "Applying modern technologies when drilling directional wells with long horizontal boreholes." Izvestiya vysshikh uchebnykh zavedenii Gornyi zhurnal, no. 5 (August 6, 2020): 13–18. http://dx.doi.org/10.21440/0536-1028-2020-5-13-18.

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Introduction. Directional drilling of wells is currently carried out by a rotary steerable system and conventional equipment including a mud motor with an adjustable skew angle. Either of the two methods has particular advantages. Research aim is to analyze the technologies provided by various service companies in the field of directional and horizontal wells drilling in order to provide means of improving the utilization capacity of the conventional bottom hole assembly in long horizontal boreholes. Methodology. When drilling directional wells with a small departure from the vertical and well

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Banks, David, Neil Burnside, Rob Westaway, Günter Zimmermann, and Hannes Hofmann. "Exponential trends in flowback chemistry from a hydraulically stimulated deep geothermal borehole in granite; Pohang, South Korea." E3S Web of Conferences 98 (2019): 08001. http://dx.doi.org/10.1051/e3sconf/20199808001.

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Samples of flowback water from a 4.3 km deep geothermal borehole in granite (Pohang, South Korea) were collected following a period of hydraulic stimulation by injection of surface water. Electrical conductivity, temperature and water chemistry of the flowback water were measured. To a first approximation, the data conform closely to a simple ‘mixing tank’ model, with an exponential trend between two end members: an initial injected surface water to a more brackish ‘resident groundwater’ composition. Significant deviation from the ‘mixing tank’ trend would be an indication of significant recen

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Cho, Sung-Ho, Hyun-Key Jung, Hyosun Lee, and Yesol Kim. "Development of Real-Time Borehole Deviation and Magnetic Gradient Logging System and its Preliminary Field Test." Journal of the Korean Society of Mineral and Energy Resources Engineers 56, no. 1 (2019): 23–32. http://dx.doi.org/10.32390/ksmer.2019.56.1.023.

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Griguletsky, V. G. "To the problem of calculation of the drill string lower part assemblies for preventing borehole deviation." Construction of Oil and Gas Wells on Land and Sea, no. 9 (2021): 10–14. http://dx.doi.org/10.33285/0130-3872-2021-9(345)-10-14.

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Liu, Zhi Guo, Ji Hua Cai, Kuan Cai Yang, and Min Tian. "Analysis of Wire-Line Coring Hydro-Hammer Technologies in Xiaoqinling Gold Ore Deposit." Applied Mechanics and Materials 275-277 (January 2013): 2284–89. http://dx.doi.org/10.4028/www.scientific.net/amm.275-277.2284.

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After introducing SYZX75 wire-line coring hydro-hammer, we launched the study on its assorted drilling technology and field trial in Xiaoqinling gold ore deposit of Lingbao City of Henan Province. Field trial results showed that unit efficiency per month, average hour efficiency, roundtrip length and core recovery percentage in cracked formation could be improved obviously. We also could observe the decline of drilling cost and borehole deviation. It can be further popularized.

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van Dalfsen, W., J. C. Doornenbal, S. Dortland, and J. L. Gunnink. "A comprehensive seismic velocity model for the Netherlands based on lithostratigraphic layers." Netherlands Journal of Geosciences - Geologie en Mijnbouw 85, no. 4 (2006): 277–92. http://dx.doi.org/10.1017/s0016774600023076.

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AbstractA seismic velocity model is necessary to map depth and thickness of subsurface layers interpreted from seismic reflection images. We have built a seismic velocity model (VELMOD-1) for the entire Netherlands area, both onshore and offshore, using non-confidential data (sonic logs, time-depth pairs, lithostratigraphic marker depths and downhole position data) of 720 boreholes in DINO - National Geoscientific Portal, and a preliminary isochore map (in seismic traveltime representation) of the layer of the Zechstein Group. The model is based on the Vint-zmid method applied to the following

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Bautista-Anguiano, Joshua, Carlos Torres-Verdín, and Joachim Strobel. "Mechanistic 3D finite-difference simulation of borehole spontaneous potential measurements." GEOPHYSICS 85, no. 4 (2020): D105—D119. http://dx.doi.org/10.1190/geo2019-0632.1.

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The quantitative interpretation of borehole spontaneous potential (SP) measurements via Nernst’s equation often relies on limiting assumptions such as shallow mud-filtrate invasion, negligible streaming potentials, and uniform borehole symmetry. To overcome these limitations while honoring the governing physics of coupled mass transport associated with SP phenomena, we have developed a 3D finite-difference algorithm to simulate borehole SP measurements acquired across water-bearing rocks that incorporates electrochemical, membrane, and electrokinetic SP. The algorithm is based on a mechanistic

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Karkush, Mahdi O., Mahmood D. Ahmed, Ammar Abdul-Hassan Sheikha, and Ayad Al-Rumaithi. "Thematic Maps for the Variation of Bearing Capacity of Soil Using SPTs and MATLAB." Geosciences 10, no. 9 (2020): 329. http://dx.doi.org/10.3390/geosciences10090329.

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The current study involves placing 135 boreholes drilled to a depth of 10 m below the existing ground level. Three standard penetration tests (SPT) are performed at depths of 1.5, 6, and 9.5 m for each borehole. To produce thematic maps with coordinates and depths for the bearing capacity variation of the soil, a numerical analysis was conducted using MATLAB software. Despite several-order interpolation polynomials being used to estimate the bearing capacity of soil, the first-order polynomial was the best among the other trials due to its simplicity and fast calculations. Additionally, the ro

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Ijasan, Olabode, Carlos Torres-Verdín, and William E. Preeg. "Fast modeling of borehole neutron porosity measurements with a new spatial transport-diffusion approximation." GEOPHYSICS 78, no. 3 (2013): D151—D168. http://dx.doi.org/10.1190/geo2012-0433.1.

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The quantitative integration of nuclear measurements into the in situ petrophysical and geophysical evaluation of rock formations has been elusive because of the lack of efficient algorithms to simulate them. We discovered a new method for rapid numerical simulation of borehole neutron measurements using Monte Carlo (MC)-derived spatial flux sensitivity functions (FSFs) and diffusion flux-difference (DFD) approximations. The method calculates spatial sensitivity flux perturbations using flux-difference approximations of one-group neutron diffusion models. By invoking appropriate boundary condi

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Zhu, Baolong, Qi Li, Yi Wu, and Jing Li. "Analytical Model for Predicting Stress Distribution and Load Transfer of Tension-Type Anchor Cable with Borehole Deviation." International Journal of Geomechanics 20, no. 7 (2020): 04020085. http://dx.doi.org/10.1061/(asce)gm.1943-5622.0001716.

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Kravets, Svyatoslav, Vladimir Suponyev, Valery Shevchenko, Alexander Yefymenko, and Vitaliy Ragulin. "Determination of the regularities of the soil punching process by the working body with the asymetric tip." Eastern-European Journal of Enterprise Technologies 2, no. 1 (110) (2021): 44–51. http://dx.doi.org/10.15587/1729-4061.2021.230256.

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The presence of analytical dependencies describing the process of static soil puncture by a working body with a conical asymmetric tip is necessary to create installations with the ability to control the trajectory of the soil puncture. The paper considers the features of the process of interaction of an asymmetric conical tip with the ground. Analytical relationships were obtained to determine its reactions during a static puncture, the deviation of the head trajectory from a straight line, to determine the size of the soil compaction zone and the magnitude of the destructive force that acts

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Johnson, Jay A., Nicolai B. Mortensen, Christopher J. Gibson, Joshua J. Goetz, and Alexander J. Shturmakov. "Replicate ice-coring system testing." Annals of Glaciology 55, no. 68 (2014): 331–38. http://dx.doi.org/10.3189/2014aog68a034.

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AbstractDrilling the WDC06A borehole at the West Antarctic Ice Sheet (WAIS) Divide with the Deep Ice Sheet Coring (DISC) drill began in December 2007 and was successfully completed in December 2011 to a depth of 3405 m. The design and construction of a replicate coring system for use with the existing DISC drill began in 2010. In January 2012, the new replicate coring system was tested in the parent borehole at WAIS Divide. While a full deviation was not completed during the test period, much was learned about the mechanical, electrical and operational aspects of the system. Extensive testing

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Chi, Shihong, and Xiaoming Tang. "Stoneley-wave speed modeling in general anisotropic formations." GEOPHYSICS 71, no. 4 (2006): F67—F77. http://dx.doi.org/10.1190/1.2216928.

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For determining anisotropy using acoustic logging data, Stoneley waves are the only wave modes that are sensitive to formation properties transverse to the borehole axis. We derive Stoneley-wave speeds in deviated and horizontal wells penetrating anisotropic formations. We first apply the elastic theory of an anisotropic body to find the radial displacement of a borehole cross section under uniform pressure. We then derive the effective formation modulus based on quasistatic analysis. Finally, we derive a two-dimensional analytical solution for low-frequency Stoneley-wave speed in a horizontal

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Hunziker, Jürg, Eric Laloy, and Niklas Linde. "Inference of multi-Gaussian relative permittivity fields by probabilistic inversion of crosshole ground-penetrating radar data." GEOPHYSICS 82, no. 5 (2017): H25—H40. http://dx.doi.org/10.1190/geo2016-0347.1.

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In contrast to deterministic inversion, probabilistic Bayesian inversion provides an ensemble of solutions that can be used to quantify model uncertainty. We have developed a probabilistic inversion approach that uses crosshole first-arrival traveltimes to estimate an underlying geostatistical model, the subsurface structure, and the standard deviation of the data error simultaneously. The subsurface is assumed to be represented by a multi-Gaussian field, which allows us to reduce the dimensionality of the problem significantly. Compared with previous applications in hydrogeology, novelties of

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Baumert, Michael E., Erez N. Allouche, and Ian D. Moore. "Experimental investigation of pull loads and borehole pressures during horizontal directional drilling installations." Canadian Geotechnical Journal 41, no. 4 (2004): 672–85. http://dx.doi.org/10.1139/t03-090.

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Installation loads during 19 commercial horizontal directional drilling (HDD) installations were monitored using new in-hole monitoring cell technology. Fifteen of these installations were part of an 8.3 km section of 203 mm diameter by 4 mm wall thickness steel gas distribution line. The predominant soil type was silty clay, and similar construction practices were employed for all installations. The resistance to pipe advancement within the bore was found to increase in an approximately linear manner, varying from 0.20 to 0.31 kN/m, with a mean of 0.26 kN/m and standard deviation σx = 0.03 kN

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Melton, Joe R., Diana L. Verseghy, Reinel Sospedra-Alfonso, and Stephan Gruber. "Improving permafrost physics in the coupled Canadian Land Surface Scheme (v.3.6.2) and Canadian Terrestrial Ecosystem Model (v.2.1) (CLASS-CTEM)." Geoscientific Model Development 12, no. 10 (2019): 4443–67. http://dx.doi.org/10.5194/gmd-12-4443-2019.

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Abstract. The Canadian Land Surface Scheme and Canadian Terrestrial Ecosystem Model (CLASS-CTEM) together form the land surface component of the Canadian Earth System Model (CanESM). Here, we investigate the impact of changes to CLASS-CTEM that are designed to improve the simulation of permafrost physics. Overall, 18 tests were performed, including changing the model configuration (number and depth of ground layers, different soil permeable depth datasets, adding a surface moss layer), and investigating alternative parameterizations of soil hydrology, soil thermal conductivity, and snow proper

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Ryanto, Theo Alvin, Eko Rudi Iswanto, Yuni Indrawati, Abimanyu BW Setiaji, and Hadi Suntoko. "Sediment Thickness Estimation in Serpong Experimental Power Reactor Site Using HVSR Method." Jurnal Pengembangan Energi Nuklir 22, no. 1 (2020): 29. http://dx.doi.org/10.17146/jpen.2020.22.1.5949.

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A study about sediment thickness mapping was conducted in Serpong Experimental Power Reactor Site. This reactor is planned to be built in a high seismic activity area. Sediment thickness is one of many factors that could affect the site response. A high sediment deposit could amplify and prolong the earthquake waves. This condition could make the reactor building more vulnerable to seismic hazard. The sediment thickness was estimated using the microtremor HVSR method. The parameter used for sediment thickness calculation was obtained from the borehole and cross-hole seismic survey and was test

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Wang, Fa Gang, and Guo Qiang Xiao. "Research on Application of the Television Image Logging Technique in the Englineering Test Borehole." Advanced Materials Research 962-965 (June 2014): 2708–11. http://dx.doi.org/10.4028/www.scientific.net/amr.962-965.2708.

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A whole image of a reconnaissance well with acoustic time, acoustic amplitude and video can be obtained by an image logging apparatus. The results (feature dip/strike and azimuth, joint density analysis, synthetic cores, feature stereograms, rose diagrams, deviation plots of borehole) of image logging are displayed in the form of well explained figures, intuitionistic, vivid and easy to be analyzed. Image well logging technique has played an important role in oil and gas exploration, but its application in construction engineering is still in its initial testing phase. The hardware constitutio

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Zhang, Fan, Yun Long Mu, Shuang Cheng, Jin Gen Deng, Bao Hua Yu, and Yuan Cao. "Wellbore Stability of Shale below Salt Formation of Faqui Oilfield in Iraq." Applied Mechanics and Materials 641-642 (September 2014): 451–57. http://dx.doi.org/10.4028/www.scientific.net/amm.641-642.451.

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Serious borehole collapse has occurred in shale below salt formation of Fauqi oilfield in Iraq. The Lots of bedding shale cavings returned to ground. The strength of bedding shale cores with different bedding dip angle are tested, which changes along in a high degree with the dip angle and reach the minimum in 50°-60°. The experimental results are regressed by different strength criterion, which demonstrate that McLamore strength criterion is more accurate. The collapse pressure of shale below salt formation is calculated by Mohr-Coulomb criterion and McLamore criterion respectively. The maxim

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Cawthorn, R. Grant. "Identification of Anorthite-enriched Plagioclase Antecrysts in the Bushveld Complex, South Africa." Journal of Petrology 60, no. 6 (2019): 1109–18. http://dx.doi.org/10.1093/petrology/egz025.

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Abstract The origin of cumulate grains in layered intrusions is actively debated. Earliest views assumed that all grains grew in the now-exposed magma chamber. An alternative view is that some grains were injected from deeper magma chambers (never to be exposed). Such grains have been called antecrysts. In this model upward reversals in the anorthite content of plagioclase grains in anorthosite-bearing sequences have been considered to indicate such processes, and are considered to represent the bases of cycles. Data from two deep boreholes in the upper half of the Bushveld Complex permit test

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Sapińska-Śliwa, Aneta, Tomasz Sliwa, Kazimierz Twardowski, Krzysztof Szymski, Andrzej Gonet, and Paweł Żuk. "Method of Averaging the Effective Thermal Conductivity Based on Thermal Response Tests of Borehole Heat Exchangers." Energies 13, no. 14 (2020): 3737. http://dx.doi.org/10.3390/en13143737.

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This work concerns borehole heat exchangers and their testing using apparatus for thermal response tests. In the theoretical part of the article, an equation was derived from the known equation of heat flow, on which the interpretation of the thermal response test was based. The practical part presents the results of several measurements taken in the AGH Laboratory of Geoenergetics. They were aimed at examining the potential heat exchange capacity between the heat carrier and rock mass. Measurement results in the form of graphs are shown in relation to the examined, briefly described wells. Re

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